Remain at form don't working

Product Support
1

Your software
My Mautic version is: 3.3.3
My PHP version is: 7.4
My Database type and version is: 5.7 Maria

Your problem
My problem is:
Can’t Remain at form after submiting.
After Successful Submit Action form display Message and don’t know why.

These errors are showing in the log:
No log entries

Steps I have tried to fix the problem:

  1. Create form and use Automatic - Via Javascript (recommended) code in HTML
  2. Form Settings: Form details - Successful Submit Action - Remain at form

I think is a Bug but mybe not. Can someone help?
Thank you